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A211960 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-4 0
0, 0, 65, 3146, 64705, 695587, 4904333, 25825865, 109813056, 396433235, 1257315972, 3589635788, 9392825390 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 3 of A211963

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

..0........0........0........0........0........0........0........0

..1.2......0.1......1.2......1.2......1.2......1.2......1.2......1.2

..0.3.4....2.3.4....1.3.4....3.4.5....3.4.5....3.3.4....3.4.5....3.4.5

..5.6.7.6..0.5.6.0..5.2.5.6..0.6.6.0..5.6.0.4..5.6.6.1..5.2.1.6..5.0.5.6

CROSSREFS

Sequence in context: A237858 A075474 A069225 * A293695 A133853 A188693

Adjacent sequences:  A211957 A211958 A211959 * A211961 A211962 A211963

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 26 2012

STATUS

approved

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Last modified October 18 13:26 EDT 2019. Contains 328161 sequences. (Running on oeis4.)